Two drugs, Drug A and Drug B, are intended to lower the blood pressure in hypertensive patients. Suppose that you are going to use a matched pairs design to compare the effec- tiveness of the two drugs, and that you have 60 subjects available for your experiment. In this case, you would:

(A) randomly divide the 60 subjects into two groups, giving Drug A to the subjects in one group and Drug B to the subjects in the other group.
(B) randomly divide the 60 subjects into 30 pairs, and then flip a coin to decide which subject in each pair would receive Drug A or Drug B.
(C) randomly divide the 60 subjects into 30 pairs, and then randomly select 15 of the pairs to receive Drug A, with the remaining 15 pairs receiving Drug B.
(D) subjectively divide the 60 subjects into two groups according to their characteristics (such as degree of hypertension), and then randomly give Drug A to half of the subjects in each group, and Drug B to the other half